Postal voting is a method of voting that allows individuals to cast their vote by mail instead of going to a physical polling station. It is commonly used by individuals who are unable or choose not to vote in person due to reasons such as travel, illness, or disability. The correct term for postal voting is "proxy voting". Proxy voting refers to the process of authorizing someone else to cast a vote on behalf of the voter. In this case, the voter uses the postal system to send their vote to a designated proxy who will then vote on their behalf. This allows individuals to participate in the voting process without physically being present at the polling station. Therefore, the correct answer is option 2 - proxy voting.